< Free Open Study >
Syntax Description:

• ip-address— Neighbor’s IP address.

• peer-group-name— Name of the peer group. See section 8-19.

• default-weight— 1 to 65535.

Purpose: The weight attribute has meaning only to the local router. By default, advertisements received from BGP neighbors have their weight attribute set to 0. This command sets all routes learned from a particular neighbor to the default weight used in the command.

Cisco IOS Software Release: 10.0. Peer group support was added in Release 11.0.

Configuration Example: Setting the Route Weight for the Local Router

The following configuration sets the weight of all routes learned from neighbor 10.1.1.2 to 451:

Router A

interface Serial0

 ip address 10.1.1.1 255.255.255.252

!

router bgp 1

 neighbor 10.1.1.2 remote-as 2

 neighbor 10.1.1.2 weight 451

__________________________________________________________________________

Router B

interface Loopback0

 ip address 172.16.0.1 255.255.255.0

!

interface Loopback1

 ip address 172.16.1.1 255.255.255.0

!

interface Loopback2

 ip address 172.16.2.1 255.255.255.0

!

interface Loopback3

 ip address 172.16.3.1 255.255.255.0

!

interface Serial0

 ip address 10.1.1.2 255.255.255.252

 clockrate 64000

!

router bgp 2

 network 172.16.0.0 mask 255.255.255.0

 network 172.16.1.0 mask 255.255.255.0

 network 172.16.2.0 mask 255.255.255.0

 network 172.16.3.0 mask 255.255.255.0

 neighbor 10.1.1.1 remote-as 1

Verification

Verify the setting of the weight attribute by examining the BGP table on Router A:

rtrA#show ip bgp

BGP table version is 6, local router ID is 172.17.1.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal

Origin codes: i - IGP, e - EGP, ? - incomplete



   Network          Next Hop            Metric LocPrf Weight Path

*> 172.16.0.0/24    10.1.1.2                 0           451 2 i

*> 172.16.1.0/24    10.1.1.2                 0           451 2 i

*> 172.16.2.0/24    10.1.1.2                 0           451 2 i

*> 172.16.3.0/24    10.1.1.2                 0           451 2 i

Troubleshooting

1. Verify that the BGP neighbors are in the Established state using the show ip bgp neighbors command. If the neighbor relationship is not in the Established state, see section 8-23.

2. If the neighbors are in the Established state, the only error would be an incorrect IP address in the configuration statement neighbor ip-address weight default-weight.

< Free Open Study >